Bridge of longitudinal segmental prefabricated small box girder, and construction method thereof

Abstract

The invention discloses a bridge of a longitudinal segmental prefabricated small box girder, and a construction method thereof. The bridge comprises two or more girders extending in the length direction of the bridge, wherein the side girders are located on the two sides of the bridge, and the middle girder is located between the side girders on the two sides of the bridge; each girder comprises aplurality of small prefabricated box girders and is formed by adopting a segment method; every two adjacent girders are connected through a small box girder transverse cast-in-place segment between the corresponding prefabricated small box girders; and the plurality of prefabricated small box girders comprise a front supporting point segment prefabricated small box girder, a front span inner cross girder segment prefabricated small box girder, a mid-span segment prefabricated small box girder, a rear span inner cross girder segment prefabricated small box girder and a rear supporting point segment prefabricated small box girder. During construction, firstly, segments of the prefabricated small box girder are manufactured; then all the prefabricated small box girders are conveyed to a construction site to be spliced into the girder; and finally, transverse connection of the girder is conducted. Compared with a method using a traditional prefabricated segmental girder, the method of theinvention greatly reduces the number of segments and simplifies construction.

Description

technical field [0001] The invention relates to the technical field of bridges, in particular to a bridge and a construction method for longitudinally segmented prefabricated small box girders. Background technique [0002] In the field of bridge engineering, the applicable span of existing prefabricated small box girders is 25m to 35m. For bridges with a span of less than 25m, it is not economical to use a small box girder, and the cost is significantly higher than that of prefabricated hollow slab girders and cast-in-place girders; for bridges with a span of more than 35m, if a small prefabricated box girder is used, the structural weight will be too large The problem of large-scale transport vehicles is required, which brings great difficulties to urban bridge construction. The transportation process of a large number of overweight prefabricated small box girders will bring great pressure to the existing urban roads along the line, which may cause damage to roadbeds, roa...

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Problems solved by technology

[0005] However, the cost of steel-concrete composite beams is significantly higher than that of prefabricated small box girders. It is not economical to use a large number of steel structures. If prefabricated small box girders are to be used in urban bridge projects with a span of more than 35m, transportation must be solved. The problem

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